IEC 61869-11-2017 pdf free.Instrument transformers – Additional requirements for low-power passive voltage transformers.
This part of lEG 61869 is a product standard and covers only additional requirements for low- power passive voltage transformers (passive LPVT). The product standard for low-power passive voltage transformers is composed of IEC 61869-1. along with lEG 61869-6 and this document with specific requirements.
This document is applicable to newly manufactured low-power passive voltage transformers with analogue output having rated frequencies from 15 Hz to 100 Hz for use with electrical measuring instruments or electrical protective devices.
This document covers low-power passive voltage transformers used for measurement or protection and low-power passive voltage transformers used for both measurement and protection.
Low-power passive voltage transformers have analogue output only (for digital output or for technology using any kind of active electronic components refer to future IEC 61869-72). Such low-power passive voltage transformers can include the secondary signal cable (transmitting cable). The secondary voltage of the low-power passive voltage transformer is proportional to the primary voltage. Derivative output signals are not within the scope of this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
Clause 2 of IEC 61869-6:2016 is applicable with the following additions:
IEC 61869-6:2016, Instrument transformers — Part 6: Additional general requirements for low-
power instrument transformers
3 Terms and definitions
For the purposes of this document, the terms and definitions given in lEG 61869-1 and IEC 61869-6 apply with the following additions and modifications: General definitions.
The corrected phase error is calculated according to the formula in Note 1 of definition 3.4.1106. For passive LPVT the individual corrected phase offset cor replaces the rated phase offset or Since rated delay time for passive LPVT Is not applicable, tdr is zero. The phase offset correction shall be in the range of ± 300 mm and specified with the suitable accuracy and number of decimals according to the relevant accuracy class (with a minimal resolution of 1 mm).
If the accuracy is based on the individual correction, the correction factors or the corrected transformation ratio and the corrected phase offset shall be indicated on the rating plate. Additional information on the designation of the accuracy class using the corrected transformation ratio and the ratio correction factor is given in Annex 11 B.
5.6.1103 Accuracy requirements for measuring low-power passive voltage transformer
5.6.1103.1 Accuracy class designation
For measuring passive LPVT, the accuracy class is designated by the highest permissible percentage of the ratio error at rated primary voltage and with rated burden.IEC 61869-11 pdf download.